how to fix the fog lights not working in my Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

603 words

Problem Statement

Learn how to diagnose and fix fog lights not working in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to avoid shocks or shorts.
•Allow the engine to cool before accessing electrical components to prevent burns.

Symptoms

•Fog lights do not illuminate when switched on
•Fog light warning indicator on the dashboard (if applicable)
•Possible blown fuse related to fog lights
•No sound or clicking noise from the switch when activated
•Other exterior lights (headlights, turn signals) functioning normally

Diagnostic Steps

1
Check the fog light switch for proper operation and ensure it is not damaged.
2
Inspect the fog light bulbs for any signs of damage or burn-out.
3
Verify the fog light fuse in the fuse box by pulling it out and visually inspecting it or using a multimeter.
4
Test for power at the fog light connector using a multimeter while the switch is activated.
5
Check the wiring harness for any signs of damage, corrosion, or loose connections.
6
Inspect the relay for the fog lights in the relay box for proper function and replace if necessary.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Multimeter
•Pliers or fuse puller
•Screwdriver set

Parts Required

•Fog light bulbs (if burnt out)
•Fog light fuse (if blown)
•Fog light relay (if faulty)

Related Faults

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Diagnostic Steps

1
Check the fog light switch for proper operation and ensure it is not damaged.
2
Inspect the fog light bulbs for any signs of damage or burn-out.
3
Verify the fog light fuse in the fuse box by pulling it out and visually inspecting it or using a multimeter.
4
Test for power at the fog light connector using a multimeter while the switch is activated.
5
Check the wiring harness for any signs of damage, corrosion, or loose connections.
6
Inspect the relay for the fog lights in the relay box for proper function and replace if necessary.

Solution

1. Preparation

Gather tools and parts.
Ensure the vehicle is parked on a level surface and the ignition is off.
Disconnect the battery negative terminal to prevent electrical shorts.

2. Replace Fog Light Bulbs

Access the fog light assembly by removing the underbody cover if applicable.
Remove the fog light housing by unscrewing the retaining screws.
Disconnect the wiring harness from the fog light bulb.
Twist the old bulb counterclockwise and pull it out.
Insert the new bulb into the socket and twist it clockwise to secure.
Reconnect the wiring harness and reassemble the fog light housing.
Reattach any underbody covers that were removed.

3. Check and Replace the Fog Light Fuse

Locate the fuse box under the dashboard or in the engine compartment.
Identify the fog light fuse using the fuse diagram on the cover.
Use a fuse puller or pliers to remove the fog light fuse.
Inspect the fuse for a broken filament; replace it with a new fuse of the same amperage if necessary.
Reinstall the fuse back into the fuse box securely.

4. Inspect and Replace the Fog Light Relay

Locate the relay box, typically found in the engine compartment.
Identify the fog light relay using the diagram on the relay box cover.
Remove the relay by pulling it straight out.
Test the relay with a multimeter or replace it with a new relay.
Reinstall the relay back into the relay box.